Add rad/s

COVESA VSS Standard Catalog already supports deg/s for angular speed,
but in some areas rad/s is commonly used. This PR adds rad/s,
so that it can be used both in the standard catalog as well
as in user extensions.

Signed-off-by: Erik Jaegervall <[email protected]>

Author: erikbosch

spec/units.yaml

@@ -96,6 +96,12 @@ degrees/s:
   unit: degree per second
   quantity: angular-speed
   allowed-datatypes: ['numeric']
+rad/s:
+  definition: Angular speed measured in radians per second
+  unit: radians per second
+  quantity: angular-speed
+  allowed-datatypes: ['numeric']
+
 
 # Power